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KR-102962266-B1 - ELECTRODE FOR OXYGEN EVOLVING, AND METHOD OF PREPARING THE ELECTRODE

KR102962266B1KR 102962266 B1KR102962266 B1KR 102962266B1KR-102962266-B1

Abstract

A method for manufacturing an electrode for an oxygen evolution reaction is provided, comprising: an immersion step of immersing a nickel foam in an aqueous solution containing iron trichloride ( FeCl₃ ) to simultaneously perform etching of the nickel foam and coating of iron on the nickel foam, and a heat treatment step of heat-treating the nickel foam.

Inventors

  • 이윤수
  • 장지훈

Assignees

  • 현대자동차 주식회사
  • 기아 주식회사

Dates

Publication Date
20260507
Application Date
20210108

Claims (12)

  1. An immersion step of immersing nickel foam in an aqueous solution containing iron trichloride ( FeCl₃ ) and nickel chloride ( NiCl₂ ) to simultaneously perform etching of the nickel foam and coating of a catalyst layer on the nickel foam, An aging step for aging the above nickel foam, and It includes a heat treatment step for heat-treating the nickel foam, The molar ratio of the iron trichloride and the nickel chloride is 1 : 0.1 to 0.75 : 0.25, and The above immersion step is performed at a temperature of 0 ℃ to 50 ℃, and A method for manufacturing an electrode for an oxygen evolution reaction, wherein the above aging step is performed by repeating the process of drying the nickel foam at 0°C to 50°C for 1 minute to 30 minutes and then immersing it in the above aqueous solution for 1 minute to 20 minutes, 2 to 10 times, and the heat-treated catalyst layer comprises an iron-nickel composite including iron-nickel oxide, iron-nickel hydroxide, or a mixture thereof.
  2. In Paragraph 1, A method for manufacturing an electrode for an oxygen evolution reaction, wherein the concentration of iron trichloride in the above aqueous solution is 0.005 mol/L to 0.2 mol/L.
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  5. In Paragraph 1, A method for manufacturing an electrode for an oxygen evolution reaction, wherein the above immersion step is performed for 0.5 to 5 hours.
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  9. In Paragraph 1, A method for manufacturing an electrode for an oxygen evolution reaction, further comprising, prior to the heat treatment step, a step of drying the nickel foam at 50°C to 150°C for 3 to 24 hours.
  10. In Paragraph 1, A method for manufacturing an electrode for an oxygen evolution reaction, wherein the above heat treatment step is performed at 250 ℃ to 500 ℃ for 1 hour to 12 hours.
  11. In Paragraph 1, The above heat treatment step is carried out under an inert gas atmosphere containing hydrogen ( H₂ ), and A method for manufacturing an electrode for an oxygen generation reaction, wherein the inert gas comprises hydrogen ( H₂ ) in an amount of 1 volume% to 10 volume% relative to the total volume of the inert gas.
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Description

Electrode for Oxygen Evolution, and Method of Preparing the Electrode The present invention relates to an electrode for an oxygen evolution reaction comprising nickel foam, and a method for manufacturing the same. The development of new and renewable energy is accelerating to address the depletion of fossil fuels and climate change. Among these, alkaline water electrolysis, consisting of hydrogen and oxygen production reactions, is a core technology for the hydrogen economy, fuel cells, and artificial photosynthesis. Hydrogen production technology, which has been relatively extensively studied, is currently entering the maturity (commercialization) stage. On the other hand, oxygen generation technology through water electrolysis is composed of a relatively complex mechanism and requires much further research. In particular, since the oxygen generation reaction, which is relatively slow and requires a large overpotential, determines the overall efficiency of the alkaline water electrolysis device, the development of related technologies is urgent. Furthermore, it is necessary to address the phenomenon where the catalyst detaches from the gas diffusion electrode or electrode performance deteriorates due to bubble resistance during oxygen generation, and to improve the economic feasibility of existing electrode manufacturing methods to enhance performance and ensure stability. FIG. 1 is a process flowchart of a method for manufacturing an oxygen evolution reaction according to one embodiment. Figure 2 is a graph of the CV analysis results for the nickel foam used in Example 1-1 and the oxygen evolution reaction electrode prepared in Example 1. Figure 3 is a graph of the LSV analysis results for the nickel foam used in Example 4-1 and the oxygen evolution reaction electrode prepared in Example 4-1. Figures 4 and 5 are graphs of CV and LSV analysis results for the nickel foam used in Example 1-1 and the electrodes for oxygen evolution prepared in Examples 1-1 to 1-3. Figures 6 and 7 are graphs of CV and LSV analysis results for the nickel foam used in Example 1-1 and the electrodes for oxygen evolution prepared in Examples 2-1 to 2-2. Figures 8 and 9 are graphs of CV and LSV analysis results for the nickel foam used in Example 1-1 and the electrodes for oxygen evolution prepared in Example 1-1, Example 2-1, and Example 3. Figures 10 to 12 are graphs of XPS analysis results for the nickel foam used in Example 1-1 and the electrodes for oxygen evolution reaction prepared in Example 1-1, Example 2-1, and Example 3. Figures 13 and 14 are graphs of CV and LSV analysis results for the nickel foam used in Example 1-1 and the electrodes for oxygen evolution prepared in Examples 4-1 to 4-3. Figure 15 is a graph of the CV analysis results after 1,000 cycles for the nickel foam used in Example 1-1 and the oxygen evolution reaction electrode prepared in Example 1-1. The advantages and features of the technology described below, and the methods for achieving them, will become clear by referring to the embodiments described below in detail together with the accompanying drawings. However, the forms of implementation are not limited to the embodiments disclosed below. Unless otherwise defined, all terms used in this specification (including technical and scientific terms) may be used in a meaning that is commonly understood by those skilled in the art. Furthermore, terms defined in commonly used dictionaries are not to be interpreted ideally or excessively unless explicitly and specifically defined otherwise. When a part of a specification is described as "including" a certain component, unless specifically stated otherwise, this means that it does not exclude other components but may include additional components. In addition, the singular form includes the plural form unless specifically mentioned otherwise in the phrase. A method for manufacturing an electrode for an oxygen generation reaction according to one embodiment includes an immersion step of immersing a nickel foam in an aqueous solution containing iron trichloride ( FeCl₃ ) to simultaneously perform etching of the nickel foam and coating of iron on the nickel foam, and a heat treatment step of heat-treating the nickel foam. FIG. 1 is a process flowchart of a method for manufacturing an oxygen evolution reaction according to one embodiment. The method for manufacturing an oxygen evolution reaction will be described in detail with reference to FIG. 1. First, nickel foam is immersed in an aqueous solution containing iron trichloride ( FeCl₃ ) (S1). In the immersion step (S1), the etching of the nickel foam and the coating of the iron compound on the nickel foam can be carried out simultaneously by the ionization method of an aqueous solution containing iron trichloride ( FeCl₃ ) represented by the reaction equation 1 below. [Reaction Equation 1] FeCl 3 + Ni → FeCl 2 * + NiCl * (etching) FeCl 3 + NiCl * → FeCl 2 * + NiCl 2 2FeCl₃ + 2Ni → FeCl₂ + 2NiCl₂ + Fe (coating)